Mechanical telephone



G. W. LORD.

MECHANICAL TELEPHONE.

(No Model.)

Patented Mar UNITED STATES GEORGE \V. LORD, OF BOSTON, MASS.,

PATENT OFFICE.

ASSIGNOR TO TIIE LORD ACOUSTIC MECHANICAL TELEPHONE.

SPECIFICATION forming part ot Letters Patent No. 359,215. dated March 8. 1887.

(No nim'rl.)

To all whom it muy concern.-

Be it known that I, GEORGE W'. LORD, a citizen of the United States, residing at Boston, iii the county of Suffolk and State of Mas- 5 siichusetts, have invented a new and useful Iniproveineiit iii Mechanical Telephones, ofwhieh tho following,r is c. specification.

In :i iiiechuuiinl-telophoiie system ithftsheen found t'lnitl the vibrations are transmitted io most successfully when the conducting-wire extends straight :iwiiy from the transmitter iii :i direction ut :ifi-ight. :ingle to the plano of' the transmittingil iulihrugni; but as this direction is not always practicable in the construction i5 of lines the foil eeieiioy of this forni ot' telephone is not always attained. It is also desirable that the telephonie instruments should he insulated or detnehediis fur :is possible from surrounding obit-ets.

The obje-ei 0i' uns invention is to obtain :i i niecliiiuiriii telephone l'roui which the line can I always be extended torn cousiderabledistiiiicc iii n direction :it right angles to thel plziiie of the diziplirngiii sufficient to insure the satisi factory trinisiiiixson of' viliriitions, no mutter iu what direction the line muy extend from L tho points whit-,h :1ro connectent, thus enitbling the use ot'thiie mechanical telephone to ho largely iiiorensi-il. It iilso hais for its object the complete insulation ofthe teleplionesnind, in :idilition,t he increased etlioioncy ofthe saine.

To the end tluit tht-.so results muy bie accomplished, 1hi invention consists in the coinbiinition of :1. inrrlizinioni-telephone onse with iiexihlu :ittatehiiig (leviers which allow itA to ho turned f-.oiiii-uiently in :in v direction, :is hereiiiziltei' set forth.

'l'lio invention :ils-o consists in the construction ofthe tolvlihozie, :is hereinafter more fully sot. forth.

In the :it'toi-npniiyiingr druwings, Figure 1 ii-i :i Sectional viirw ot iny improved telephone :ittueheit to tho wiill ol' n building'. Fig. 2 in :i pliin vii-w of thi.l Hume, :tud Fig. Ii is :.iiiothel' pion vii-w showin.;r thu line extended :it :in :lolite :ingle to thel wiill ot'lho building.

in thi'so .si-verni tiignrrs thisiiiuo h-tteiH ro- `ri to the snuit: tiiit'ts.

Referring totheilriiwiniis, is llio rondnrling-wire.

iin :i woll, lo wliirh thi.' telephone iii :il

tached, nud C is the telephone. This consists ofn hollow case, ot' wood, ot'un oval t'orm and nitide in two ports, a und b. It provided with perforntious at. euch end,

D is the diaphragm, which may he nitide ot' :my suitable :untel-itil :ind is secured :ieross the case, so that there is :i cavity on each side of the diaphragm. A convenient iuuuuer ot' securing the diaphragm het weeii the two ports of the cose is shown inthe drawings. The da` phrngni D is stretched over :i wooden ring, e, and suitably secured to the saine. This ring rests in :i recess in thi: sciftioii fr., and hears against aslioiilder on the suine. The other Sect-ion bears ihitly iigiiinst tho ring. When the diaphragm has been placed iiipositioii,tl1e two sections of the onse are united together in any Siiititlile manner. Around the outside ot' the case is a baud, li, ot' some noii-resoiiiiiit material siiiti'ibiy secured to the ciise, the effect ot which is to prevent :my resonance iii the euse. It has been found tlizit sheetlead is ii suitable innteriul for this hund; hut :luy other suitable iiiiiterizil niiiy he used. hiiiid or lining of iiim-i'i-soiniiit iiniti'rinl muy he phnfed inside the mise.

F is :i wirt-,whirh is connected liy :i iiiit, d, t0 a kiioli ot' wood on the inside of the clinplirtigiii und passes through the sinne, :is in other inochunit-iil ti-lepliont'rs. This wire passes through :ipi-rforiitioii iii :t plug ot' vulcanized riililwr, f', which is inserted into the pirrforai` tion iii the section u ofthe wise. lliis` wire F is provided with il liiil\', /,1o wlii'h the lint:- wiio is aittiielied.

For the purposo of :itiiehing the ense. iii iin)I desired position, niiitiihlv wires or cords, l, :iro used, which puns through und :ire :iltilclied lo rings t[ on the sides ot' the euse, uuid cords or wirt-s infini: :ittiirhi'd to suino stutionziry i-iii|i port. These llifxihln roiiiiiotionspri-inittho telephone, when tho limewire is stretched, to ho set :it :my desired :ingle to thun-:ill ol' :t building, :isl shown in Vig. Il, wtiihl :it tliois'zimc timo lin* voinlni-ting-wire will lniniiiiitiiiuutl :til right :nigh-s to the iliiililiriig'ni. ttilw` l, whit-.h is pr'ifi-i'iihlv .i llrxihlispeaking,r tnlw- Huch :in iniisril willi nonnfoi-ins oll ti-lup|io1ies--- vouneutn thiiniri'ior ol' tln` section li willi tho interior ol'tlnbuilding'.

'lho perforation to thi` iii'i'tion l in iliii't'lly opposite the eenterol' the diaphragm, and conl same and attached to a support, substantially 35 seqnently in connection with the hollow chaluhcr in front of the diaphragm. The sound wave:l transmitted through the tube I are received most ettectively and, without lons of in- Lensity,are concentrated upon thediaphragm.

As shown in Fig. 3, the speaking-tube I may have a branch ear-tube, le, attached to il., so that the user may speak and hear at the same time.

For the purposes of a call,au ordinary elec` tric call-bell connected to the conducting-wire may be used, orin some cases a whistle within the speaking-tube will be suicient.

This form oftelephone may be placed within a building as well as outside ofthe same.

In my Patent No. 356,594, granted January 25, 18S?, I have shown a telephone ofeonstruetion similar to that herein described,and having a weight, suspended from it by flexible cords. This combination I do not claim in the present application; nor do I broadly claim the combination ofthe flexible cords and telephone withoutthe support.

Having thus described my invention, what I claixn,and dosi re to secure b yLettciS Patent ol' the United States, is-

l. A telephone-case. in combination with the flexible. cords or wires attached to each side of said case and toa suitable supporti, substantially as setf'orth.

2. The elongated telephone-case C, in eombination with the cords or wires attached to each side of said case, extending along the as set forth.

3. The combination, substantially as and for the purpose set forth, ot' the case C, the diaphragm D within said case, the conductingwire A, the dexible connect-ions L L, attached to each side of the case and each attached to the outside ofa building, and a tube connecting the interior of the ease to the interior of the building.

two wooden sections, in combination with a diaphragm held between Said Sections and havl ing a cup-shaped cavity or space on each side ofit, and wire connected to said diaphragm, substantially as set forth.

' The combination of a telephone-case con hand in the presence of the subscribing witnesses,

GEORG E W'. LORD.

Nitnessesz GEO. W. TIsnALn, Timo. C. TISDALE.

lIn witness whereof I have hereunto set my.

4. An oblong telephone-case consisting ol' 45 

